氧化铝陶瓷凝胶注模成型凝固动力学研究  

Solidification Kinetics Of Alumina Suspension By Gel-Casting

作　　者：仝建峰[1] 陈大明[1] 李宝伟[1] 黄浩[1] 

机构地区：[1]北京航空材料研究院先进复合材料国防科技重点实验室,北京100095

出　　处：《航空材料学报》2008年第3期49-52,共4页Journal of Aeronautical Materials

摘　　要：凝胶注模成型(Gelcasting)是一种近净尺寸陶瓷成型工艺,它是通过高分子聚合物自由基聚合反应来实现陶瓷料浆的原位固化的。通过建立料浆温度与凝固时间的曲线,来研究陶瓷料浆的凝固动力学,是简便可行的研究方法,结果表明:"驰豫时间"可以成功地描述陶瓷料浆的凝固过程。在Al2O3陶瓷料浆Gelcasting成型工艺条件优化的基础上,制备出了气孔分布均匀的Al2O3坯体。Gel-casting is a novel net-shape method for forming ceramic green bodies, which is based on the principle of the in situ coagulation of a powder suspension via a reaction-rate-controlled maeromoleeule polymerized reaction after casting. The coagulation kinetics of alumina suspension for gel-casting forming were investigated through noting the change of temperature during gelling. The experi- mental results indicate that the coagulation kinetics can be successfully studied by the dynamic relaxation experiments intrems of ＂coag- ulation time＂ , which provide a convenient and practicable way to research the coagulation kinetics of ceramic suspension. After optimi- zing the processing conditions of the alumina nitride suspension for gel-casting forming, a green body with uniform, narrow and unimodal pore size distribution was prepared.

关 键 词：凝胶注模成型 凝固动力学 氧化铝陶瓷 自由基聚合反应 陶瓷料浆 AL2O3 高分子聚合物 工艺条件优化 

分 类 号：TQ174.62[化学工程—陶瓷工业] TQ174.758[化学工程—硅酸盐工业]